Start at the Alta Valtellina bike village in Rasin Isolaccia. Launch section passing through the heart of Isolaccia. Start uphill to Pedenosso Alto S.Antonio tot km 7 5 km on asphalt and then start on dirt road. At the Torri di Fraele (1930 m) one of the most typical features of Valdidentro on the route of the ancient Via Imperiale you enter the spectacular valley of the same name. Passing near the small lake of Monte Scale you will reach the Cancano dams, two artificial lakes of enormous dimensions that constitute an authentic work of hydroelectric engineering inserted in an environment of particular naturalistic interest. We skirt the first dam on the left side, we cross the dividing wall and we pass on the right side of the second dam over 12 km mostly flat on a wide dirt road When we reach the locality of SGiacomo, keeping to the right we proceed along an easy path towards Val Mora near the Swiss border we are still on the trail of the ancient Via d'Alemagna, a historical and important commercial link between Valtellina and the neighbouring countries of northern Europe until 1487. Before crossing the border, turn and proceed in the direction of Pra Grata to return to SGiacomo Along the SGiacomo dam on the right side, after about 3 km completely flat in the Val Pettin area, deviation and start of the climb to Alpe Trela 2200 m, km 2 on a dirt road with a compact bottom At Alpe Trela, after a short flat section, go up again on the path for km 2 to Passo Trela 2300 m Descent on single track 35 km in the direction of Val Pila, having reached the bottom of the valley, continue on the Val Torta path with continuous ups and downs until Lake Trela. Continuous ups and downs to Lake Livigno 1800 m, a spectacular artificial lake that marks the border between Italy and Switzerland Climb to Passo Alpisella 5 km on a dirt road with a compact bottom At Passo Alpisella 2350 m, descent towards the SGiacomo dam, first section on a dirt road until the spectacular path that passes near the source of the Adda and leads to the bottom of the SGiacomo valley. km 2 Short flat stretch and again uphill in the direction of Lago Nero for 15 km on the path to reach Bocchette di Trelina mt 2283 Spectacular descent in the direction of Val Vezzola first part on fun singletrack and then continue on a dirt road to the junction of the path that goes to the valley of Foscagno after a series of technical ups and downs down and back on the flat road Decauville Passing in the locality Arnoga crossing the road to Livigno in the direction of Val Viola, a valley dominated by the mountains that are part of the Cima Piazzi and Corna di Campo group, with the Cima Piazzi, Cima Viola and Cima Dosde towering above it. An initial uphill stretch of 1 km takes you to Val Verva. At Baite Verva bassa, on a newly created path, proceed along 3 km of fun ups and downs. From Paluetta km 1 km on varied terrain and you reach Alpe Boron mt 2057 Short descent and immediately turn right to face a climb of about 1300 km, at times very challenging Wall of Prei You reach Prei particularly scenic place where the view can sweep over all the surrounding valleys covered in the first part of the track through a fun new flat path and slightly downhill you reach Alpe Pone Again on a new downhill path you skirt the Again on a new downhill path you skirt the Valdidentro alpine ski slopes until you reach the junction with the Palancana road, a long flat stretch immersed in thick pine forests among which extraordinary panoramic windows open onto the Bormio area Breathtaking descent towards the historic-naturalistic area of the Venini military fort and the Paluaccio di Oga reserve Taking advantage of the fun paths built for the Oga bike park, you fly towards Motte la Corva and, passing along the winter cross-country skiing track and the Isolaccia cycle path, you arrive at the